Hennessey & Speed: More remarkable than its ZR1-baiting speed is this 707-hp CTS-V’s decorum.

Do not confuse Hennessey and Hennessy. Though homonyms, one is a 20-year veteran of the tuner world whose machines require courage—the kind that originates in one’s nether regions—to fully unwind. The other is a 246-year-old cognac distiller whose hooch builds courage. Hennessey Performance and its founder, John Hennessey, gained notoriety in the ’90s for mixing Dodge Vipers with turbochargers. Hennessy also gained notoriety in the ’90s, when the hip-hop community extolled the spirit’s magical ability to mix with everything from cannabis to Coke. Drinking Hennessy while driving a Hennessey is not recommended.